Understanding the Law of Conservation of Mass

Understanding the Law of Conservation of Mass

Assessment

Interactive Video

Chemistry, Science

6th - 8th Grade

Hard

Created by

Ethan Morris

FREE Resource

The video tutorial explains the law of conservation of mass, which states that the mass of products and reactants in a chemical reaction must be equal. The instructor demonstrates this principle using a beaker of cobalt nitrate and a beaker of sodium carbonate. By mixing these substances, a precipitate of cobalt carbonate is formed, and the mass is shown to remain constant, thus proving the law of conservation of mass.

Read more

5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the law of conservation of mass state?

Mass changes with temperature.

Mass can be created or destroyed.

The mass of products and reactants must be equal.

Mass is only conserved in closed systems.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which chemicals were used in the experiment setup?

Cobalt chloride and sodium nitrate

Sodium chloride and cobalt sulfate

Cobalt nitrate and sodium carbonate

Sodium sulfate and cobalt carbonate

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is formed when cobalt nitrate and sodium carbonate are mixed?

Sodium chloride

Sodium nitrate

Cobalt sulfate

Cobalt carbonate

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What observation proves the law of conservation of mass in the experiment?

The color of the solution changes.

The volume of the solution decreases.

The temperature of the mixture increases.

The mass remains the same after mixing.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is the law of conservation of mass important in chemical reactions?

It allows for the calculation of reactant quantities.

It ensures that energy is conserved.

It helps in predicting the color of products.

It determines the speed of reactions.